6700 Salmon Lake Road, Sydenham, ON K0H 2T0
Frontenac Provincial Park is situated in Southern Ontario about 40 km (25 miles) north of the historical city of Kingston. Kingston is located on Lake Ontario just west of the Thousand Islands and is approximately half way between Montréal and Toronto. GPS coodinates for the Park Office lat. 44.5076716, long. -76.5553575.
Take Highway 401 east until you get to Kingston. Take Exit 613 - Sydenham Road and go north. Follow the directions from Kingston.
Follow the 20 west to the junction with Ontario's Highway 401. (Alternatively, you could go west on the boulevard Métropolitain (40), then south on the 540 to the 20 and the 401.) Continue on the 401 till you get to Kingston. Exit at Sydenham Road (Exit 613) and go north. Follow the directions from Kingston.
Since I live in Kingston I rarely have the occasion to come to Frontenac Park from the north. Therefore the information given here may not be entirely accurate.
You could use Highway 416 to get to the 401, then drive toward Kingston, get off at Sydenham Road (Exit 613) and follow the route outline for Kingston below.
NOTE: there is a back way from Ottawa through Westport.
CLICK GOOGLE MAPS FOR DIRECTIONS FROM YOUR LOCATION.
Head north on Sydenham Road (Frontenac County Road 9) for approximatively 20 km. At the end of the road you will see a Provincial Park sign (Blue and white), telling you to turn left on County Road 5.
As you enter the village of Sydenham, watch for the another Park sign on your right (1.9 km). From then follow the signs. You will go though Sydenham crossing a small bridge over the Millhaven creek and passing a Foodland grocery store on your right as you turn right and leave the village. After driving 13 Km on curvy County Road 19, you will see a larger Park sign indicating a right turn and a drive of 2.4 km. This is the Salmon Lake road (just after the Outfitter), it ends at Frontenac Park.